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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0994f8f780d3f09fbcf699a91f8c28e0379dd17829f50c1a329ca24978173ee' 
  AND token = '9bpNsMPA/Pfz2+cd1o2I4RFKvw4IuoJfGmll0dZvw1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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