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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cea4f4cd554a261dfd5640a99d20295b6ce8974a99c890a2b5420d6c0257efe' 
  AND token = '8+ux6iDstm77NDDMDqUBzjcGQRe5lJWx6HnJPIFgGoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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