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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037e903238bd7c33d38ebd7469231ac3acfddce3cdc099305196a5866338b2a7' 
  AND token = 'Oh5iDpsYjKnhcda0tTbeY3thwVDINtgAO/83M54y6HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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