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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be79aabac63b744596cb4e55b66fa96abfebce28e50785f3687aaf75491d3d4' 
  AND token = 'arHV3wa4VXfBU40+6lc3gRiZctGWgM8kdKT/Qr1+2Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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