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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335bb97ea47ec144f33d991d22b65f9817aa9eb109e699c408e100b36a779f80' 
  AND token = 'F3Ko0wXk3vr1186nJG8jca7YvXDls7gKhL4naOk3xow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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