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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c9bf269f7a84de7f17e9e251d43a707ebd32beb10971d387f373cf409f31fd' 
  AND token = 'tj5VkQy6fJIhwX4tVNOuUJDfalvmtH+tsJ5CG71vc/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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