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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34aefb1efdd1c53fae6120917a3ea4acbbb38812f939c59565b270d458d3012' 
  AND token = '4aHNk+sjm4RgLSuYz/2WYRSFa7xZSVdQT09QlvgUIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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