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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dbe1c8df552e2355f34cc6db1a1ef06f8afdb7597cf347f71bcc7b7b15d592' 
  AND token = '/4ouGbcHEwCfiuBR2P371P5fsra/bxZPPpXy9ir3Rl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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