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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067f747ad71f134289c7f6ab09307afcc411c5b0817eb3c8f68db64caa97832c' 
  AND token = '1uHIeCDrrgoV00dAxoa28nux4i2jnytzu6fZtzmG8Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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