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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd254c14e12c576d64149f4894c11da502efff10d52f387b04fbce15e6bc67ab' 
  AND token = 'MaAFfOJU5Llf3TsADsRfuSPP5jrN4zWu8uB0VIkEESc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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