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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f11218bfb50ac9db096aafd408859c9d0007a037daa3f0fc9138a4dfb0634a2' 
  AND token = 'vQkmThRe16I8E8Wa5AXm2vykVVvKwkjtXK664pL1udk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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