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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d6c5e92d296056e3351d66830091d41e8f3ac343ab5caaf86cd8c6b970a9fa' 
  AND token = '+QXs4U1PJh09XiXW8vL/tVpAxOrqavXjvZMHCM94lxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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