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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb844113b8caf3b6237ea9db3e737680edbb3bc148aa00ea66fc73c2c8d5910' 
  AND token = 'hjdlqZG0/fnFgPw+th3y/K9/zdzOiicmI3JtjObdXA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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