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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfa94600eeb447b0b6cce387b006417f14314f0d82ae35c272e228f22a97868' 
  AND token = '0u6g4iPfjSA5l9n63BBX7H5bYU+pNBIqvfsT5NUDGUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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