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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554f54059a550e0af9048c533c999fe687d33802d1aa3c96a23e6aa745cc4ffb' 
  AND token = 'rpMIVAucP5e26JBbOm1P8OoSpQiHPCyN9WlPDYOicU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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