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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2129f640d1c7ce14fa64ec9443becd689d892f1ad58018cde645c64ac09a8c3f' 
  AND token = 'gis/Rsq2TWPEOsN5mk5uMvV5oAiX2rpcr+0Qkaj3qJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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