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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f860ff03b71d12c46646b29b9c953722eaa8e61a17aeeb7a9baccd00e02084ea' 
  AND token = '3I/xD+i0Hfz+VHcahAAKD4x5CRkZ6xt+uSHn287lvso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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