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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092baf452d9e74bfbf2a158ce1de3b71a0c3fe2760a80daa747f85c2abb6cc43' 
  AND token = 'T+fsC0iuBGn0lH5XXAssBmeN3j4HfVU3Rqhy7evJCO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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