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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312ba4a70c74f22623bb279537d189a3407a5f010ffcea7d29d440e1049f1b6' 
  AND token = 'OagyJayrwfXDFPWjdJNyOJUPtLqq2rudAoUJyDGNg6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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