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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203ea4c17eb976bbccf0c67cdee2e2f714980c51536de8bfbfa6ba3c9329fae1' 
  AND token = 'E7n9wn4n3cy+ws1HA5vhaIjNB6VtpGsdwzcK/76YReE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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