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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832bdb5234b7db2fcd96ce81dfc41119864c32cc7a94c09d0ae61b20e6a67cdf' 
  AND token = '4uTeHsTkpvzX7mrsQwX50c0dp0Shn3oY4EB4ymclCPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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