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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf9109c2b89f0f8ab13b090401c188eb3a175bbe6a5c2a78f4da82049bead10' 
  AND token = 'ovQuknvNlmniyqg4vvEGHcoLYpyfiGpUnzKGBO58WeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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