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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab71ee2a67ff5f6b2aeabbb3c1497d3be79d6d13be5ab84b7b235f03f5338c39' 
  AND token = 'k3h1oqBHA/Ro+XPy5Vi56Fs3RGUyeznsPSetLAw0ce4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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