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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d59d7b5195c22e10392aa431129e47b877583ecadde99c5f8148ea476f2aec' 
  AND token = '2w6LQ3CkIjIz7LdGRDMliNa81ZMX8VLWvLpulRktzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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