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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b45e9b38b164c52f8534cd3ab875d07ec77c1c4e80e04480fbc1f20959a253' 
  AND token = 'alWhTdVVnlBWXI0PZ5LpGqoOW/67hpI9iSNNsfV91dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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