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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19551cb82cc94612bdf9d5038dc513397ce36312f3a1ffd1a1b3478bc16f8a6e' 
  AND token = 'Y0B4W66VyVe6rVSoCmk7L/g/DnP0A/DUBPNNFKHMwsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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