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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd099776c00bf9bb175370631149efc50296f59323c12f9bd168e8ab9ce48d4' 
  AND token = '50OsOz6IAYK2KbGCuIIE2wZcGBJ0eq5Fvp3vsuS2K2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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