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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c4a0cf12842200e6852884faddf7a4d45afd4bf41ef099b665fd1e2ea8e98d' 
  AND token = 'mCe5z6oi+pKCmftfROBpcZqa/KmU0QrnLJNpPlFP47o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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