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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4a0f4ea4d9192fc6260629117bc302d82800099fbe75de66a19cf67b41addd' 
  AND token = 'p1mC0KSz9WGpNb/+OpvPsPkhwpUIVXa1A+l2kf8zJDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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