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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f53ac739520e6a450956a575cd5e919e115656e73e86ed112a6f9e06d1247b' 
  AND token = 'chqIlBfRKUHOquoQxeqke/2oB9ZvnLqtfWTTe7hwATQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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