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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb14775cccf7ac0d61d0b1fb78466c0e50dae54d95722473e576e597fc15e868' 
  AND token = '2etzkwZq93nSRj+Ec9gLBnJpnbYRQv/fn4uXvLcfyUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}