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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a032ec7743bdab82eddb83ba9a54e587b3b142c3c447b1c221266c8d6ee6b565' 
  AND token = 'u/WSlvOGdS5+y1BlmxP4U8en9EcNz4pnqIsSV6ZgUNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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