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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f482c968130323c738f7f0c6c9fecf322d0710d59bc3c14d3d44b4b0c5b893' 
  AND token = 'M2ap1E3hKLP6EVKPZECigE2weXZQaqp5GM66nvEokRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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