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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb0ff3d4dbeb152946f0808edb7861e4624c4d77368c817eff2543ec1b4f429' 
  AND token = '+pIqJSmBy0N56+eCZ4i89sxTyRs27aglvLCApYj3yDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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