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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963ab1c8d707ae0bcf9dae27a00377c1ae3ef41ca2448cf676a126a0533be0a7' 
  AND token = 'IftDyA1XMG0FxNjH3Cc6o6RYOGEy9xlW2bpzvfreEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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