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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2478fdb6e05fee256161bc59044b0dda31d89a2713db031bdb39a663c2358a31' 
  AND token = 'lyk7EvhbX3PLsR6i3MwJnMLbUrjsktRAK0TeYpocY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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