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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e995a8c2b7041b0624237dd92af6daac1a9697e85b53ec5112919b36e48a78c5' 
  AND token = 'pHSSPWWimmCEzJ1QZ3CM2iYeJ4w7Vdxu7dk5TNcjqHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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