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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8f009a7f6f28587e001f09e1b391ad36fbc5c8c4ed6e7933dc1fbcaec3bc8b' 
  AND token = 'git7qt3P6TfNxyKUEuByj1FHzmzRNQ3qXaGdXAscCmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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