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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e7ef367eee3c2bd9ab2563123c987d5a91374581d8cff6a5423377922db93e' 
  AND token = 'KacuFZM+CgwV2aJfz4LFbu3Q1OFRKegAwE0I+pHz4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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