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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd5b7c3a87ed58305633f7dad3e8b9be681da7f863280781d362635b18624b0' 
  AND token = 'CcebzItDnf/DBcNhpfVs9THr7/yKgLpdc9b35fMVufg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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