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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e56e306f382adcc6abd1cafc96023ca891a5f7e08b4ae9ced6638d3978ad6' 
  AND token = 'VnV7pvTYVtsDolqpT3ukzDFRuZaAEkHHBUSHH77DNUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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