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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed7b9a2ec9a6c9ca37ff1d0cd16676edd3582e0174f5e8715eca2e902bc3132' 
  AND token = 'KjRlzvc1OtJw5wy3+MSpuOgYN342MnqTnH+2zYE2rE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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