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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e9f97240bada7b2424b7c1ceac4d41d4bad89d869b20c37d2749f8d6d0ac11' 
  AND token = 'keaihU5JUYO5Vw5Xr4elgPUfZWLDXIZseJcd1rkdSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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