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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebe8ca4ff06e8919996deb5d3305fb7026877db27acd6396caef17f8483ccee' 
  AND token = 'oZuHRBMEkEINWiLUXOzrybkZWX40ooT2Va+pWYa0DP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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