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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b34aa2c6a938504b41951c76d6f0ff154e58fa0cd98f7e94756974ceb7b832b' 
  AND token = 'P7dPlBPsLFq8zSJoc+Qb19nTgqGQr1mreUcq2zdIwRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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