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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c27397662bb0b28820c2b4dea93d3b027be313ba6b6979121936af93e30594' 
  AND token = '3KJcjpkAkFaRi8CbC70Owol+ta1gOebDSjGBsZNQreM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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