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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed76985a64285f97b5996604764c1c36630b865c82352079f6d7ecf11165150' 
  AND token = '0Sfmqip8iHBEdFaiRBCoRNWv8TUzb1NybsW5MHVr0L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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