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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb3d2a45628a5ae37fc62450decc87e7e046ce9fb98ec33659e139ac8ae9233' 
  AND token = 'iW57Dz6nAUfs72vmM+0+fMP0t3RGJVzHLgvIem97pZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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