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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849d8aad80d26664a5e98f3d6d3574f63c3b11453c764499c1561cd86e4098e6' 
  AND token = 'YxzDq5LOLmybWfelXA6arHceBwDI3+w671ujztc3rvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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