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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa2a383266674f5b68a07f4082d772db6d0951985d8c3d2253e2826ff5c5145' 
  AND token = '59ApGrNLAnCqXTa5Yl5Zer04/muRID9wJWaIXqw4o+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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