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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5b354be5a92181b8edb9140ac08d9c4d155fd43e725b95672d5df59791cb0c' 
  AND token = 'DLbtm0EFweyjTeQZppYN2MuQiC1nfR5vjK2mpynG/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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