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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e01af64e3f2dc9e1c06e14992ae4b2cec544344386fe99b5285aeb3c1c83c8' 
  AND token = 'mkHCDs3g22M05BN4cr32iaerh5mfKECKKIBEH4Nalx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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