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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3193e685c4071a120227ceef51ea77585523a0a060e9b5007932ef6a40dcd672' 
  AND token = 'fG6KbmJgry4AAjGpmQ8c/9ZAeYMNeD47n65DbKLnFBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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