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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18406484051aa9c5be3eeefc732231bdf0a924c280eac07a595c1ef27a062e0f' 
  AND token = 'J9uyVv8freOb/+VWVS/6K0y9r8HdMXevwz1NOsk/73c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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