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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64806f7c9a38efbdd7286ca0053543c983e1b875d64746c77754b3fa869b4ff1' 
  AND token = 'autqLt6xtjE89Xc/vDEsY0WqT5a0cftKwbdt1xGrGqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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